The New Zealand one-cent coin was the smallest denomination coin of the New Zealand dollar from the currency's introduction in 1967 to its demonetisation, along with the two-cent coin, in 1990. With a diameter of 17.53 millimetres, it is the smallest coin ever issued of the dollar, and at 2.07 grams in mass the lightest as well. Coins issued in 1970 circulated for 20 years before they were demonetised on 1 May 1990.